What is the rising action of the curious incident of the dog in the night time?

In "The Curious Incident of the Dog in the Night-Time," the rising action focuses on Christopher's investigation into the death of his neighbor's dog, Wellington. As he uncovers more details about the incident, Christopher embarks on a journey that leads him to unexpected discoveries about his family and himself. This investigation sets off a chain of events that challenge Christopher's perceptions and push him out of his comfort zone.